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An ozone hole is formed when the amount of ozone in the upper atmosphere gets depleted to dangerously low levels. Normally, Chlorofluorocarbons, or CFC's, are responsible for this. In sunlight, CFC's form chlorine radicals which react with Ozone to produce Oxygen gas. If XCl is a CFC, the steps in which reactions proceed are:

In sunlight in the upper atmosphere: XCl ------> X + Cl

Cl is the chlorine radical, which is extremely reactive.

Cl + O3 -----> O2 + ClO

ClO is another radical, which is also extremely reactive.

ClO + O3 -----> Cl + 2O2

As you can see, the Chlorine radical, Cl, is produced again at the last step, allowing it to repeat the steps again and again. In fact, it is estimated that each Chlorine atom can react with up to 200,000 ozone molecules, before decaying.

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